How to do nothing in the "empty" or "remaining" case when pattern matching a string in Rust?

Hello everyone! I just started learning Rust and encountered a problem that seems very strange to me. I'm writing a simple function that takes a string and only does something for certain values. For all other values, I want nothing to happen, i.e., just skip this case. Here's my code: ```rust fn process_command(command: &str) { match command { "start" => println!("Starting..."), "stop" => println!("Stopping..."), "restart" => println!("Restarting..."), // here I want to do nothing for all other commands } } ``` But the compiler gives an error: `non-exhaustive patterns: `_` not covered`. I understand that I need to add a catch-all pattern, but I don't want to print or execute anything. When I add `_